【摘要】 茶树是典型的聚铝植物之一,茶是广泛使用的饮料,因而饮茶是人体摄入铝的主要途径。本文综合分析了关于茶叶中铝的浓度、化学形态和生物可给性的实验研究成果,发现一般情况下茶汤中铝浓度范围为 1~mg/L,其中大约有 90%以上的铝以有机形态存在。茶汤中铝的形态分布是不断变化的,没有固定的存在形式大量实验证明,茶水中可能存在的主要铝形态有铝的多元酚配合物、铝的草酸盐、铝的氟化物、Al3+和它的水解产物等。饮茶会适度的增加尿中铝的含量,但是茶叶中存在的铝似乎并不比其它饮食资源中所含铝具有更大的生物可给性,但也不能排除茶水中可能含有像铝麦芽酚这样一些具有一定生物可给性和毒害神经性的铝形态。更多还原

【Abstract】 Tea is one of the typical Al-accumulating plants. Tea infusion is a widely consumed beverage, so tea drinking is the major source of dietary Al intake. This paper reviews published studies on the concentration, form and bioavailability of Al in tea infusion. In general, the total concentration of Al in tea infusions is in the range 1~6 mg/L, probably more than 90% of this Al is organic form. The distribution of Al form in infusion is changeable with time. Investigations indicated that the main forms existed in tea infusion included polyphenolic complexes, Al oxalate, Al fluoride, Al3+ and its hydrolysate etc. Tea drinking could moderately increase the Al excretion in urine, however, it does not seem that the Al present in tea is much more bioavailable than that from other dietary sources. At the same time, it also cannot be dismissed that tea infusions may contain particularly some bioavailable and neurotoxic compounds such as Al maltolate.更多还原